Any party to a hearing may make a motion to continue the hearing for good cause shown. Any such motion shall be in writing directed to the person or persons who will be conducting the hearing. The motion shall state the specific reasons a continuance is necessary and shall be filed with the executive secretary and served on the hearings examiner, if any, and the opposing party at least five days prior to the scheduled hearing date. In unusual circumstances and only where the reason for the continuance could not reasonably have been foreseen, the motion may be made when the party becomes aware of the reason.